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I know the hydra uses speed-density (MAP) for its calculations, and the MAF for IAT, but I lost my maf sensor putting my car back together, and I either need to buy another one, or just put on a custom intake or something.

You can replace the IAT with a GM sensor, but apparently there is more than one resistance range of GM IAT sensor out there (see the thread I started in the Impreza subforum on the Hydra forums for more details), so make sure you get the right one.

Ok that sounds good. Someone PM'd me and said I can use a MAF from a scion xA/xB in the subaru, and especially since the hydra only uses it for IAT, I'll use that temporarily until I replace my intake with a custom one and a GM IAT sensor.